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Solar panel cost in Gwynedd (LL38)

See realistic solar installation costs, savings and payback for LL38 (Gwynedd) in under a minute using official UK data. Start with the calculator, then get a no-obligation quote from an MCS-certified installer. You can also ask the SolarByPostcode assistant to sanity-check your roof, bills and plans.

Solar Calculator

Change the settings below to see how costs and savings work for your situation.

System Size

Roof Direction

Battery Storage

Export Value

Your Numbers

Break-even
11.3 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£866
What you save every year
Profit Over 25 Years
£11,878
After paying itself off, you're this much ahead

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How we calculate this

Solar generation: Based on typical south-facing roof at 35° angle. We account for weather, dirt, and system losses (14%).

How much you'll use directly:

  • Without battery: You'll use about 40% of what you generate. The rest gets sold back to the grid.
  • With 5 kWh battery: You'll use about 70% (battery stores extra for evening use).
  • With 10 kWh battery: You'll use about 75% (more storage means less exported).
  • Panel-only payback: The official cost per kW is lower above 4 kW, so a 5–6 kW system can pay back a little faster than a 3–4 kW system on otherwise identical assumptions.
  • Battery & payback: Batteries raise self-use and cut bills, but added hardware cost often lengthens break-even at typical UK rates.
  • When a battery can still make sense:
    • Evening-heavy usage patterns
    • Time-of-use tariffs / cheap night rates
    • Low export rate vs. high unit rate
    • Heat pump or EV charging synergy
    • Optional backup/resilience (system-dependent)
    • Lower evening-hour CO₂ vs. grid

Panel costs: Uses March 2026 TIC mean installation costs: £1,827/kW up to 4 kW and £1,628/kW above 4 kW.

Other costs: Battery prices are modelled at £700 per kWh. Export tariffs vary by supplier (usually 5–15p per kWh).

Grid connection: Systems up to about 3.7 kW typically need just a notification (G98). Larger systems may need permission (G99).

These are typical values based on average usage patterns. Your actual results will vary based on your roof, shading, and how you use electricity.

Your area in context

In North Wales and Mersey, the current unit rate is 27.66p/kWh with a 70.76p/day standing charge. Your postcode’s south-facing sunshine yield is 846 kWh/kW — 84 below the regional median (930).

Read the full story

A typical roof here lands around 6.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 846 kWh per year on a south-facing roof. We value self-used electricity at 27.7p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
27.7p/kWh
Standing charge
70.8p/day
Sunshine yield (south)
846 kWh/kW
Export price (baseline)
10p/kWh

Browse the scenarios below. Each battery size has its own expand — open the one that matches your plan (or just explore). For each system size (2–8 kW) we show annual output, how much you use directly, what gets exported, annual benefit, upfront cost, break-even, and a 20-year net. Negative numbers are possible — that’s the honest trade-off when adding more battery than your usage profile justifies.

No battery 5 kW example → Annual benefit: £721, Upfront: £8,139, Break-even: 11.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1691 kWh 677 kWh 1015 kWh £187 £101 £289 £3,256 11.3 yrs £2,516
3 kW 2537 kWh 1015 kWh 1522 kWh £281 £152 £433 £4,883 11.3 yrs £3,775
4 kW 3383 kWh 1353 kWh 2030 kWh £374 £203 £577 £6,511 11.3 yrs £5,033
5 kW 4228 kWh 1691 kWh 2537 kWh £468 £254 £721 £8,139 11.3 yrs £6,291
6 kW 5074 kWh 2030 kWh 3044 kWh £561 £304 £866 £9,767 11.3 yrs £7,549
7 kW 5919 kWh 2368 kWh 3552 kWh £655 £355 £1,010 £11,394 11.3 yrs £8,807
8 kW 6765 kWh 2706 kWh 4059 kWh £748 £406 £1,154 £13,022 11.3 yrs £10,066

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £871, Upfront: £10,239, Break-even: 11.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1691 kWh 1015 kWh 677 kWh £281 £68 £348 £5,356 15.4 yrs £1,611
3 kW 2537 kWh 1522 kWh 1015 kWh £421 £101 £522 £6,983 13.4 yrs £3,467
4 kW 3383 kWh 2030 kWh 1353 kWh £561 £135 £697 £8,611 12.4 yrs £5,322
5 kW 4228 kWh 2537 kWh 1691 kWh £702 £169 £871 £10,239 11.8 yrs £7,178
6 kW 5074 kWh 3044 kWh 2030 kWh £842 £203 £1,045 £11,867 11.4 yrs £9,033
7 kW 5919 kWh 3552 kWh 2368 kWh £982 £237 £1,219 £13,494 11.1 yrs £10,889
8 kW 6765 kWh 4059 kWh 2706 kWh £1,123 £271 £1,393 £15,122 10.9 yrs £12,744

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £945, Upfront: £11,639, Break-even: 12.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1691 kWh 1184 kWh 507 kWh £327 £51 £378 £6,756 17.9 yrs £808
3 kW 2537 kWh 1776 kWh 761 kWh £491 £76 £567 £8,383 14.8 yrs £2,963
4 kW 3383 kWh 2368 kWh 1015 kWh £655 £101 £756 £10,011 13.2 yrs £5,117
5 kW 4228 kWh 2960 kWh 1268 kWh £819 £127 £945 £11,639 12.3 yrs £7,271
6 kW 5074 kWh 3552 kWh 1522 kWh £982 £152 £1,135 £13,267 11.7 yrs £9,425
7 kW 5919 kWh 4144 kWh 1776 kWh £1,146 £178 £1,324 £14,894 11.3 yrs £11,580
8 kW 6765 kWh 4736 kWh 2030 kWh £1,310 £203 £1,513 £16,522 10.9 yrs £13,734

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £968, Upfront: £13,389, Break-even: 13.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1691 kWh 1235 kWh 457 kWh £341 £46 £387 £8,506 22.0 yrs £-762
3 kW 2537 kWh 1852 kWh 685 kWh £512 £68 £581 £10,133 17.4 yrs £1,482
4 kW 3383 kWh 2469 kWh 913 kWh £683 £91 £774 £11,761 15.2 yrs £3,725
5 kW 4228 kWh 3087 kWh 1142 kWh £854 £114 £968 £13,389 13.8 yrs £5,969
6 kW 5074 kWh 3704 kWh 1370 kWh £1,024 £137 £1,161 £15,017 12.9 yrs £8,213
7 kW 5919 kWh 4321 kWh 1598 kWh £1,195 £160 £1,355 £16,644 12.3 yrs £10,457
8 kW 6765 kWh 4938 kWh 1827 kWh £1,366 £183 £1,549 £18,272 11.8 yrs £12,701

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £983, Upfront: £15,139, Break-even: 15.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1691 kWh 1268 kWh 423 kWh £351 £42 £393 £10,256 26.1 yrs £-2,393
3 kW 2537 kWh 1903 kWh 634 kWh £526 £63 £590 £11,883 20.2 yrs £-89
4 kW 3383 kWh 2537 kWh 846 kWh £702 £85 £786 £13,511 17.2 yrs £2,214
5 kW 4228 kWh 3171 kWh 1057 kWh £877 £106 £983 £15,139 15.4 yrs £4,518
6 kW 5074 kWh 3805 kWh 1268 kWh £1,053 £127 £1,179 £16,767 14.2 yrs £6,821
7 kW 5919 kWh 4440 kWh 1480 kWh £1,228 £148 £1,376 £18,394 13.4 yrs £9,125
8 kW 6765 kWh 5074 kWh 1691 kWh £1,403 £169 £1,573 £20,022 12.7 yrs £11,429

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £998, Upfront: £17,589, Break-even: 17.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1691 kWh 1302 kWh 389 kWh £360 £39 £399 £12,706 31.8 yrs £-4,723
3 kW 2537 kWh 1953 kWh 583 kWh £540 £58 £599 £14,333 23.9 yrs £-2,360
4 kW 3383 kWh 2605 kWh 778 kWh £720 £78 £798 £15,961 20.0 yrs £3
5 kW 4228 kWh 3256 kWh 972 kWh £901 £97 £998 £17,589 17.6 yrs £2,367
6 kW 5074 kWh 3907 kWh 1167 kWh £1,081 £117 £1,197 £19,217 16.0 yrs £4,730
7 kW 5919 kWh 4558 kWh 1361 kWh £1,261 £136 £1,397 £20,844 14.9 yrs £7,093
8 kW 6765 kWh 5209 kWh 1556 kWh £1,441 £156 £1,596 £22,472 14.1 yrs £9,456

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

Figures are illustrative and use the same method as the calculator above. For exact results, adjust your roof direction, tariff, and usage in the calculator.

Before you request quotes in Gwynedd

Use the numbers above to sanity-check installer quotes. The main things to compare are system size, battery assumptions, payback claims, MCS certification, DNO paperwork and export assumptions.

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Check what MCS certification means

Understand DNO, G98 and G99 export limits

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This is a practical sanity-check request, not an instant quote promise. The Blue Ape quote route above remains available if you already want installer introductions.

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Insights for LL38

Figures below are tailored to LL38 — click through for full league tables.

Big-Roof Britain Rank #322 of 2182
5.9 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #2224 of 2996
11.3 years (UK avg 10.8 years)
~£866 /yr • £9,767 upfront
Standing-Charge Drag Rank #2128 of 2996
29.8% (UK avg 26.6%) drag on savings
£258 fixed • ~£866 /yr value
Aspect Penalty View ranking →
East −16.6% West −20.9%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in LL38

Monthly generation per kilowatt of solar panels

kWh 25 Jan 42 Feb 75 Mar 105 Apr 114 May 111 Jun 107 Jul 93 Aug 76 Sep 49 Oct 31 Nov 19 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 40.4% of an average month (Dec–Feb)

Best / worst month: May / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 28 kWh per month; the average month produces around 70 kWh. So a typical 4 kW home system would generate roughly 114 kWh in winter, or 282 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
27.66p/kWh
Daily Fixed Charge
70.76p/day
Local Sunshine
846kWh/kW
A 1 kW system generates ~846 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
6.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 29% • Flats: 6% • Bungalows: 65% Based on 292 properties

Coverage

Gwynedd (100%)

Areas Covered

Arthog a Llangelynnin, De Dolgellau

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q3 2026

Installation costs: DESNZ/MCS data, March 2026 (TIC)

Property data: EPC open data (Open Government Licence), aggregated

All estimates are typical values. Actual results vary based on your specific situation, roof characteristics, and usage patterns.

Compare nearby areas

Nearby in North Wales and Mersey

LL39 (Gwynedd)
≈3.1 km away
Local sunshine: ~825 kWh/kWp · -2% vs LL38
LL42 (Gwynedd)
≈3.1 km away
Local sunshine: ~864 kWh/kWp · +2% vs LL38
LL37 (Gwynedd)
≈4.0 km away
Local sunshine: ~878 kWh/kWp · +4% vs LL38
LL43 (Gwynedd)
≈9.2 km away
Local sunshine: ~875 kWh/kWp · +3% vs LL38
LL44 (Gwynedd)
≈10.8 km away
Local sunshine: ~875 kWh/kWp · +3% vs LL38
LL36 (Gwynedd)
≈12.2 km away
Local sunshine: ~940 kWh/kWp · +11% vs LL38

Similar sunshine across the UK

BB8 (Pendle)
~846 kWh/kWp · -0% vs LL38
PA8 (Renfrewshire)
~846 kWh/kWp · -0% vs LL38
BT49 (Causeway Coast and Glens)
~846 kWh/kWp · +0% vs LL38